Mold



w; C. STATE.`

MOLD.

APPLICATION FILED MAR. 1|. 19|9.

Patented De@ 5,1922..

Patentedv Dec. L5, 192.2;l

UNlrjl-:D STATES vIKTILL C. STATE, OF AXRON, OHIO. ASSIG'NOR TO THE GOODYEAR TIRE & RUBRER COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO.

, HOLD.

Application led March 11, 1919. Serial No. 282,000.

To all whom t may concern.' A

Beit known that I, WILL C. STATE, a citizen of the United States, and resident ofl Akron,0hio, have invented new' and useful 'Improvements-in Molds, of which the following is a specification.

My present invention relates to new and useful improvements-in molds.

-The principal object of my invention is the provision of a mold having means whereby the separable sections comprising the body of t e mold Amay be brought under pressure into the proper mating relationship and maintained inv this condition without the attendance o f extraneous ressure means.

I have illustrated in t e accompanying drawing and described .in the following specification, a preferred embodiment of my invention. I

In the drawing:

Figure 1 is a face view of a mold em#v vof the construction and manner of use of my invention as embodied in the particular construction shown 'in the accompanying drawing, I desire. to explicitly point out that while I have illustrated and hereinafter describe a mold which is particularly adapted to use in the rubber industry for curing pneumatic tires, my invention may and is intended to be effectively employed in the,I construction of molds for use in any of the arts wherein a plastic material is treated in the course of manufacture by being placed within a mold comprising separable sections which need to be either brought under pressure into mating relationship or maintained in vsuch relationship to effecty the proper molding of the material.

Referring specifically to the drawings, the numerals 5 and 6 denote two complemental separable sections of a mold desi ed for use in curing pneumatic automoblle tires. The outer peripheral edge of each mold section is chamfered lto produce, when the mold sections are placed one upon the other in the' manner shown in Figure 2, the diverging wedge surfaces 7 and 8, which (as'shown in Figure 2), define a substantially V-shaped Wedge on the outer circumference 'hof the mol For usefm connection with" this-,wedge shaped periphery of the mold', I provide'a pair of substantially semi-circular channel wedge members 9 and 10, which when mated in t e 'manner shown in Fi ure 1, form a ,substantially angular ring which encloses the outer circumference vof the mold. i

As shown, the interior channels formed in the wedge members 9 and 10,h-ave outwardly sloping walls 11, which correspond to the wedge'ffaces 7 and 8 in their degree of inclination. The depth of the channels in thewed e members is such, however, that before te tip of the Wedge, produced by the faces 7 and 8, engages the bottom wall A,

4 'the mold sections will have ibeen forced together against the resistande of the plastic i rubber. i

In this connection, it will be understood that in the tire manufacturing industry, the

tires when built upon their forming'cores (one of which is indicatedat 14) are of such cross sectional dimensions as to require that the mold section be subjected to relatively high pressure l,and the rubber condensed in volume before the mold sections come to the proper mating relationship for curing of a tire.

As shown in Figure 1, the mold sections may be laid on a table between movable pressure members, such for instance, asopposite vsets of hydraulic rams 15`and16 shown diagrammatically -in Figurer 1, in. order that .18 formed on the ends of the Wedge members 9 and 10, may be employed to hold the wedge members against displacement from the closed position to which they have been forced by-the rams. Thus, the mold sections may be maintained in thelrequired relationship bythe wedge members after the mold is removed from the rams or other wedge applying device. v

A mold constructed according to my present invention is of great advantage inv the tire manufacturing industry since it perthe wedge sections 9 and 10 may be properly y mits the 'molds to be individually handled `during the curing of the tire and eliminates as steam, Warm air, hot Water, etc., and upon `reaching the oppositeend ofthe heater, they are removed, the molds opened, contents .removed, and the molds reloaded whereupon they are again conveyed to the loading end of the apparatus. These heaters are of various types, the more common of which being of suliicient length to permit the molds to he slowly conveyed therethrough, the time of movement through the'heater representing the length ot the desired cure. lt will be apparent that the molds may he projected through the heater rapidly in ease a short cure is desired, or they may he very slowly projected through the heater in case alonger` cure is desired.,

What 'l claimis:

l. A mold comprising complemented sec,- tions adapted to deine a molding cavity, separateoppositely disposed clamps adapted to engage the periphery of said complemental lsections to subject materialv in the molding correspondingly dared faces adapted to en` cavity dened hy said oomplemental sections, to molding pressure when pressure is externally applied toA said clamps, and means adapted to apply external pressure to said clamps.

2. A mold comprising complemental sections having oppositely .disposed dared faces and adapted to define a molding cavity when mated, opposed sectional clamping inemhers having dared laces adapted to engage the dared faces ot said complemental sections to transmit pressure externally applied to said clamps to said complemental sections to torce said sections into proper mating relation, and means adapted to apply external pressure to said clamps.'

3@ A mold comprising com lemental sections adapted to deine a molding cavity and v:having oppositely disposed dared faces, op-

posed sectional clamping members having gage the liared faces oi'said complemental sections to force said sections together when external pressure is applied to said clamping members, and means adapted to app external pressure to saidclamps. y t. A mold comprising complemental sections adapted to dedne a molding cavity and having oppositely disposed dared faces, op-

posed sectional clamping members having correspondingly flared faces adapted to engage the dared faces otsaid complemental sections to transmit pressure externally applied to said clampin members to the molding cavity defined y' said complemental sections, and means for maintaining the pressure applied to 'the molding cavity after the removal of the externally applied pressure. v 6. A mold comprising vcomplemental sections having oppositely disposed dared faces c and adapted to define a molding cavity when mated, and opposed sectional clamping members having flared faces adapted to engage the dared facesy of said complemental sections to transmit .externally applied` pressure to said comp'lemental sections to 'torce'said sections into proper mating ielal tion, and removable means for locking said clamping members in their clamping relaltions. l

7. A mold comprising complemental sections adapted to denea molding cavity,

.oppositely .disposed clamps adapted to engage the periphery of said .complemental sections andadapted to .sub'ect material in the molding cavity defined y said complemental sections to molding pressure when pressure is externally appliedto said clamps, and means or'loclring said clamps in position to maintain the molding pressure upon material in the molding cavity.

8. A mold comprising complemental sec` tions adapted to dene a molding cavity,- thel periphery oit said complemental sections lxeing provided with oppositely disposed and abruptly dared surtaces, opposed sectional clamps having correspondingly* Ille disposed dared' surfaces adapted "to engagev the dared surfaces ot said complemental sections to transmit pressure externally api pliedjto the clamps to material contained 1n the molding cavity. f j

9. A mold comprising complemental sec. tions adapted to denne a moldingfcavityi, the periphery of said com lemental sectionsbeing providedwith oppositely disposed and abruptly flared surfaces, opposed sectional lamps having correspondingly dis osed are .surfaces adapted to engage (the airedV surfaces 'of said` complemental sections to .rse

transmit pressure externally appliedtothe as@ tions adapted to dene a, molding cavity, the` clamps to materiel ing caviiy, -meens forV applying external independent o the pressure applying means for holding said clamps in position to maintain the material in the molding cavity under pressure.

10. A mold comprising complemental secperiphery of said complemente'l sections being provided with oppositely disposed and abruptly ared peripheral surfaces, op-s osed sectional 'clamps having correspond- `liiugly Vflared surfaces adapted to engage the ared surfaces of the complemenia sections and adapted to transmit externally applied mesmo contained in the moldpressureht'o material contained in the mold- I lng cavity, mea-ns for applying external Y pressure to said clamps to force the com plemental sections into mating reletion, and locking members independent of the pressure applying means for holding vthe clamps o sition to maintain the material in the mo ding cavity under pressure Iafter the removal of the external pressure.

In'l witness whereof, have hereunto signed my name in the presence of two subscribing. witnesses.

'I WILL C. STATE. Witnesses:

L. M. EBRTMN, E. QLEADENBAM. 

